What?
The TL-WR703N is marketed as a “3G travel router”. Its an easily linuxed router that costs £18, has a usb host port, ethernet and can be an 802.11n wireless access point or client.
Features
- Atheros AR7240 CPU (400Mhz)
- Atheros AR9331 Chipset (integrated wireless)
- 802.11 b/g/n 150Mbps (130Mbps real)
- wireless power output 20dBm - 100mW
- 4 MB flash memory
- 32 MB RAM
- USB 2.0 port
- Powered via micro-USB socket
- Tiny form factor: 5.7cm x 5.7cm
Hacking
Awesome guides and HOWTOS
GPIO
There are a few pads on the motherboard that can be used as GPIO 
Power
There are also 5v (from the usb power socket), 3.3v (from the vreg) and ground connections available 